Tooth for excavating-dippers.



- PATENTED OUT. 15, 190'7.

H. J. BARNHART. TOOTH FOR EXOAVATING mums.

2 SHEBT88EEET 1.

APPLIOATION TILED MAB-19. 1907.

No. 868,066. v PATENTED OCT. 15, 1907.

H. J. BARNHART.

TOOTH FOR EXGAVATING DIPPERS.

APPLICATION FILED MAB..19.1907.

2 SHEETS-SHEET 2.

2/ In one:

"(Sax/4% 'the tooth which may be formed of any suitable material,

UNITED STATES PATENT "OFFICE.

' HARRY J; BARNHART, 0F MARION, OHIO, assrosos TO THE MARION STEAM sHovEL COMPANY, OF MARION, 01110, A CORPORATION OF OHIO.

'roo'rn non nxoavs'rmanrrrnns.

To all whomjt may concern.

Be it known that I, HARRYJ. Banmmn'r, a citizen of the United States, residing at Marion, in the county of Marion and State of Ohio, have invented certain new and useful Improvements in Teeth for Excavating.

this character on which the cutting point can be re newed from time to time as it becomes worn or broken without the necessity of discarding the entire tooth.- To accompl sh this I providethe body portion of the tooth with a removable cutting point which receives the greater part ofthe wear to which the tooth is subjected and which, when worn or broken, can be readily removed and replaced.

A further object of the invention is to provide means for securing such a removable cutting point rigidly to the body portion of the tooth and holding the same against all movement relatively thereto.

With these objects in view my invention consists of certain novel features of construction to be hereinafter described, and then more fully pointed out the claims.

In the accompanying drawings, Figure l is a top plan view of a tooth embodying my invention; Fig. 2 is alongitudinal, sectional view taken vertically of such a tooth; Fig. 3 is a side elevation of the body portion of such a tooth; Fig. 4 isa top plan view of Fig. 3; Fig. 5 is a: top plan view of the removable point, detached; and Fig. 6 is a side elevation ofFig. 5.

-In these drawings I have illustrated the preferred form of my invention and have shown the same as embodied ins, tooth designed for attachment to an excavating dipper. p

The reference numeral 1 indicates the body portion of and, as the same is subjected to a comparatively small amount of wear, this material need not necessarily be of the same high quality which is required for the cutting point. This body portion is provided at its rear end with a longitudinal slot 2, adapted to engage the forward edge of the front wall of the dipper, which dividcs the body portion into two portions or shanks 3 and 4 These shank's may be of any suitable thickness and length relatively one to the other and to the front wall of the dipper, but, as the greater amount of strain and wear comes upon the shank' 3 which is located on the inner face of the dipper front, this shank is preferably made much heavier than the shank 4 and is here.

shown of a length substantially equal to the depth of the dipper front and having its inner surface shaped to correspond to the shape of the dipper front. The shank Specification of Letters Patent. I Application filed 19,1907- Serial Ho- 363,262-

Patented Oct.

- 3 is provided with a series of holes 5 adapted to receive suitable bolts or rivets for securing the body portion to thedipperfront. The outer shank 4is, as stated, of

less thickness than the shank 3 and extends only a short distance beyond the first bolt hole the shank 3. The shanke is provided je'ction 6. Y

The extreme forward portion'l2 of less width than thebody portion of the tooth. The cutting point 7 of the-tooth, which-is end inclined or tapered to form a point and is bifurcated or cut away on its rear side to correspond to the inclined forward end of the body portion .which is adapted to fit within said cut-away portion. The lower arm 8 of the bifurcated portion of the point is of a length suflicient to bring the rear end thereof substantially flush with the rear end of the shank 4 of the body portion and is provided with a recess 9 adapted to receive the projection 6 carried by the lower surface of that shank. Suitable projections or ears 10, carried by the cutting point, extend on opposite sides of the'reduced end of the body portion, and, engaging the same, serve to cooperate with the recess 9 and projection 6 to hold the point against all movement relatively to the body portion. A rivet or bolt 11 extending through both the cutting point and body portion of the tooth serves to secure the two parts together and can be readily removed when it is desired so on its lowersurface with a prov I end of the body portion is cut =.away or rabbeted on its opposite sides to form a reduced formed of a high grade of hard tough steel adapted both i V to resist wear and to prevent breaking,-has its forward to detach the point from the body portion. The projection 6 and recess be arranged in any suitable man'- ner, but I prefer the arrangement herein shown, with the recess in the pointand the projection on the body portion of the tooth. The projection fits within the recess in such a manner as to prevent all lateral movement of the point relatively to the body portion and serves to relieve the rivets of all lateral strain, thus avoiding the shearing of the same.

Thus it will be seen that I have provided a tooth for excavating dippers and the like, the cutting point of which can be renewed as frequently as it becomes worn or broken without the necessity of discarding or renewing the body portion of the tooth, one such body portion being equal in length of service to a large number of the cutting points. This construction enables me to make the cutting point of the tooth, which receives by far the largest part of the wear and strain, of a very high grade of hard tough steel adapted to resist wear and prevent breaking, while the body portion of the tooth, which receives a comparatively small amount of wear and strain, may be of a cheaper grade of material, if so desired, and

whether made of a cheap grade of material or of the same enabled to reduce both the cost of manufacture, by enabling a cheaper grade of material to be used for the largest portion of the tooth, and to reduce the cost of renewing these teeth and maintaining the excavating dipper in operative condition, by enabling the cutting point to be renewed without discarding the body portion of the tooth, thus greatly lengthening the life of the latter. It will further be seen that I have provided such a toothin which the cutting point is so mounted on the body portion as to be held against all movement rel atively thereto, thus providing a tooth which is practieally integral and has all the qualities of an integral tooth. 4

I wish it to be understood that I do not desire to be limited to theexaet details of construction shown and described, for obvious modifications will occur to a pe'rson skilled in the art.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A tooth of the character described comprising a body portion having a projection on one side thereof, and a cutting point adapted to be secured to said body portion and having a recess adapted to receive said projection.

22. A tooth of the character described comprising a body portion having a projection on one side thereof and having its forward end reduced. :1 cutting point having a recess adapted to receive the forward end of said body portion and provided with projections extending on either side of said reduced portion, and having :2 second recess adapted to receive the projection on said body portion.

In testimony whereof, I niiix my signature in presence of two wit sses.

- HARRY .T. BARNIIAR'I. Witnesses W. R. \VADDICLL, E. .T. Wirrruorm' 

